292 Scientific Proceedings, Royal Dublin Society. 



MoNAGHAN. 



Both to the north and south are tracts of Carboniferous rocks ;. 

 while on the latter is a small outlyer of Trias, margined eastward 

 by Coal Measures. Nearly all the rest of the area is occupied by 

 Ordovicians. 



In the Trias to the S.W. of Carrickm across there is a consider- 

 able deposit of gypsum, some time since mined and manufactured 

 into " Plaster of Paris " at Knocknacran, until the works were 

 burned down about the year 1869. In the Coal Measure is a 

 valueless coal, while other valueless coals occur to the north of the 

 county, near Slievebeagh. The tumblers of limonite found S.E. 

 of Kingscourt are mentioned in the " Iron List," Part I. 



Yeins of lead-ore have been found in numerous places, those 

 at Lisglassan and Tullybuck being associated with antimony ; 

 while in other places there was barytes, or a little zinc. Lewis 

 states that in the " Creina Hills" there had been works for reducing^ 

 lead ; but they were abandoned some years prior to 1838. 



The majority of the mines recorded in this county seem to 

 have been worked between 1830 and 1855, but some before these 

 dates. The lodes in this county appear in general to have been 

 small ; but, on account of their number, also that others occur in 

 the neighbouring counties of Cavan, Armagh, and Louth, it 

 would appear that mining might be remunerative when trade 

 revives ; especially if reducing works, calculated to utilize all the 

 mineral products were erected at a good centre. 



Queen's County. 



Slieve Bloom, which lies to the north-west of the county, has 

 a nucleus of Ordovicians, the slopes of these*hills being Carbonife- 

 rous Sandstones and Shales. The rest of the area is occupied by 

 Carboniferous Limestones and Coal Measures, the latter being a 

 portion of the Leinster Coal-field. 



The iron ore and coals have already been described with those 

 of the Co. [Kilkenny (page 283). In this county coal was first 



